Why do we use the pH scale to indicate the acidity of a solution rather than simply stating the concentration of hydronium ions?
A) It includes the concentration of hydronium and hydroxide ions.
B) It is used because the general public understands it.
C) It is more accurate to use the pH scale.
D) It is more convenient, since the concentration of hydronium ions is so small.
D
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The high concentration of iridium at the Cretaceous Tertiary boundary may be attributable to
A. an out flux of iridium from Earth's interior. B. meteorite bombardment. C. a worldwide rise in sea level. D. none of the above
APHIS oversees both
A) organic and USDA Organic certifications. B) agricultural bioterrorism and safety of GM organisms. C) regulation of pesticides and herbicides. D) the U.S. Departments of Agriculture and Food Security.
Which of the following factors would decrease total fertility rates?
A) Poverty B) Social and economic security C) High infant mortality D) Rural lifestyle
Parent material can be rock fragments that were carried to the site by streams or glaciers
a. True b. False Indicate whether the statement is true or false